Year	kg per 2011 PPP $ of GDP
1990	0.655546242475842
1991	0.60664004330661
1992	0.609752569094945
1993	0.584941133939609
1994	0.535156198304801
1995	0.532965852211288
1996	0.510311056754122
1997	0.481649085628724
1998	0.435779201796585
1999	0.393224599099105
2000	0.387793312859662
2001	0.392750492445757
2002	0.373886914699396
2003	0.379703682522224
2004	0.329698806858523
2005	0.313540178071466
2006	0.310981417304724
2007	0.286844228431926
2008	0.24737686681926
2009	0.221641112342895
2010	0.224521962843108
2011	0.235258139807594
2012	0.221898043687144
2013	0.186094514998509
2014	0.1775660498395